package com.atguigu.srb.core.service.impl;

import com.alibaba.excel.EasyExcel;
import com.atguigu.srb.core.pojo.entity.Dict;
import com.atguigu.srb.core.pojo.dto.ExcelDictDTO;
import com.atguigu.srb.core.listener.ExcelDictDTOListener;
import com.atguigu.srb.core.mapper.DictMapper;
import com.atguigu.srb.core.service.DictService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.extern.slf4j.Slf4j;

import org.apache.commons.lang3.exception.ExceptionUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 数据字典 服务实现类
 * </p>
 *
 * @author HuoYongZhuang
 * @since 2021-06-17
 */

@Slf4j
@Service
public class DictServiceImpl extends ServiceImpl<DictMapper, Dict> implements DictService {
   @Resource
    RedisTemplate redisTemplate;

    @Transactional(rollbackFor = {Exception.class})
    @Override
    public void importData(InputStream inputStream) {
        // 这里 需要指定读用哪个class去读，然后读取第一个sheet 文件流会自动关闭
        EasyExcel.read(inputStream, ExcelDictDTO.class, new ExcelDictDTOListener(baseMapper)).sheet().doRead();
        log.info("importData finished");
    }

    @Override
    public List<ExcelDictDTO> listDictData() {
        List<Dict> dictList = baseMapper.selectList(null);
        //创建ExcelDictDTO列表，将Dict列表转换成ExcelDictDTO列表
        ArrayList<ExcelDictDTO> excelDictDTOList = new ArrayList<>();
        dictList.forEach(dict -> {
            ExcelDictDTO excelDictDTO = new ExcelDictDTO();
            BeanUtils.copyProperties(dict,excelDictDTO);
            excelDictDTOList.add(excelDictDTO);
        });

        return excelDictDTOList;
    }


    @Override
    public List<Dict> listByParentId(Long parentId) {
        //首先查看redis中是否存在数据
//        srb:core:distList在redis中是一个层次关系
        try {
            List<Dict> dictList = (List<Dict>)redisTemplate.opsForValue().get("srb:core:distList:" + parentId);
            if (dictList != null) {
                log.info("读取redis数据");
                //如果存在则从redis中直接返回数据
                 return dictList;
            }
//            如果redis出现异常，不要抛出，默默的打印错误跟踪栈之后继续往下执行
        } catch (Exception e) {
            //ExceptionUtils.getStackTrace  获取错误跟踪栈
            log.error("redis服务器异常:"+ ExceptionUtils.getStackTrace(e));
        }
        //如果不存在则查询数据库
        log.info("从数据库中回去数据列表");
        List<Dict> dictList = baseMapper.selectList(new QueryWrapper<Dict>().eq("parent_id", parentId));
        dictList.forEach(dict -> {
            //如果有子节点，则是非叶子节点
            boolean hasChildren = this.hasChildren(dict.getId());
            dict.setHasChildren(hasChildren);
        });

        try {
            //将数据存入redis,过期时间5分钟
            log.info("将redis存入到数据库中");
            redisTemplate.opsForValue().set("srb:core:distList:" + parentId,dictList,5, TimeUnit.MINUTES);
        } catch (Exception e) {
            log.error("redis服务器异常:"+ ExceptionUtils.getStackTrace(e));
        }

        //返回数据列表
        return dictList;
    }

    @Override
    public List<Dict> findByDictCode(String dictCode) {
        QueryWrapper<Dict> dictQueryWrapper = new QueryWrapper<>();
        dictQueryWrapper.eq("dict_code",dictCode);
        Dict dict = baseMapper.selectOne(dictQueryWrapper);
        return this.listByParentId(dict.getId());
    }

    @Override
    public String getNameByParentDictCodeAndValue(String dictCode, Integer value) {
        QueryWrapper<Dict> dictQueryWrapper = new QueryWrapper<>();
        dictQueryWrapper.eq("dict_code",dictCode);
        Dict parentDict = baseMapper.selectOne(dictQueryWrapper);
        if(parentDict ==null){
            return "";
        }
        dictQueryWrapper = new QueryWrapper<>();
        dictQueryWrapper.eq("parent_id",parentDict.getId()).eq("value",value);
        Dict dict = baseMapper.selectOne(dictQueryWrapper);
        if (dict == null){
            return "";
        }

        return dict.getName();
    }

    /**
     * 判断该节点是否有子节点
     */
    private boolean hasChildren(Long id) {
        QueryWrapper<Dict> queryWrapper = new QueryWrapper<Dict>().eq("parent_id", id);
        Integer count = baseMapper.selectCount(queryWrapper);
        if(count.intValue() > 0) {
            return true;
        }
        return false;
    }
}
